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  2. DDR2 SDRAM - Wikipedia

    en.wikipedia.org/wiki/DDR2_SDRAM

    DDR2 DIMMs are neither forward compatible with DDR3 nor backward compatible with DDR. In addition to double pumping the data bus as in DDR SDRAM (transferring data on the rising and falling edges of the bus clock signal), DDR2 allows higher bus speed and requires lower power by running the internal clock at half the speed of the data bus. The ...

  3. CAS latency - Wikipedia

    en.wikipedia.org/wiki/CAS_latency

    Because modern DRAM modules' CAS latencies are specified in clock ticks instead of time, ... DDR2 SDRAM: DDR2-400 400 MT/s 2.500 ns 200 MHz 5.000 ns 4

  4. Synchronous dynamic random-access memory - Wikipedia

    en.wikipedia.org/wiki/Synchronous_dynamic_random...

    At higher clock rates, the useful CAS latency in clock cycles naturally increases. 10–15 ns is 2–3 cycles (CL2–3) of the 200 MHz clock of DDR-400 SDRAM, CL4-6 for DDR2-800, and CL8-12 for DDR3-1600. Slower clock cycles will naturally allow lower numbers of CAS latency cycles.

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    www.aol.com/products/utilities/system-mechanic

    Download System Mechanic to help repair and speed up your slow PC. Try it free* for 30 days now.

  6. DDR SDRAM - Wikipedia

    en.wikipedia.org/wiki/DDR_SDRAM

    DDR2 started to be effective by the end of 2004, as modules with lower latencies became available. [19] Memory manufacturers stated that it was impractical to mass produce DDR1 memory with effective transfer rates in excess of 400 MHz (i.e. 400 MT/s and 200 MHz external clock) due to internal speed limitations.

  7. Dynamic random-access memory - Wikipedia

    en.wikipedia.org/wiki/Dynamic_random-access_memory

    DDR2 and DDR3 increased this factor to 4× and 8×, respectively, delivering 4-word and 8-word bursts over 2 and 4 clock cycles, respectively. The internal access rate is mostly unchanged (200 million per second for DDR-400, DDR2-800 and DDR3-1600 memory), but each access transfers more data.

  8. Dell Dimension - Wikipedia

    en.wikipedia.org/wiki/Dell_Dimension

    DDR2 SDRAM 2 user-accessible DDR2 SDRAM slots 400- and 533-MHz DDR2 unbuffered SDRAM Integrated Intel GMA 900 HDA 10/100 (2) PCI, (1) PCI-Express x1 41.4 cm 18.8 cm 45.7 cm 12.7 kg (28 lb) 5000 2005 Intel 915G Express Pentium 4 with HT DDR2 SDRAM 4 user-accessible DDR2 SDRAM slots 4096 MB 400- and 533-MHz DDR2 SDRAM (Non-ECC)

  9. Memory divider - Wikipedia

    en.wikipedia.org/wiki/Memory_divider

    Then, the base memory clock will operate at (Memory Divider) × (FSB) = 1 × 200 = 200 MHz and the effective memory clock would be 400 MHz since it is a DDR system ("DDR" stands for Double Data Rate; the effective memory clock speed is double the actual clock speed). The CPU will operate at 10 × 200 MHz = 2.0 GHz.

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